crushed rock

Từ điển WordNet v3.1 - WordNet Dictionary

noun

rock fragments and pebbles
• Syn:
gravel
• Derivationally related forms:
gravel (for: gravel), gravelly (for: gravel)
• Hypernyms:
rock, stone
• Hyponyms:
ballast, bank gravel, pit-run gravel, pit run, shingle